Abstract-The problem of determining the Green's function of an electric line source located in a permeable, anisotropic (μ xx ,μ xy ,μ yx ,μ yy andε zz nonzero interacting parameters) half-space above a Perfect Magnetic Conductor (PMC) ground plane (called the T M z case herein) for the case where image theory cannot be applied to find the Green's function of the PMC ground plane system has been studied. Monzon [2,3] studied the Green's function T E z problem dual to the present one for two cases; (1) when the system was unbounded, anisotropic space whereε xx ,ε xy ,ε yx ,ε yy andμ zz were the nonzero interacting parameters; and (2) when the scattering system was an anisotropic half-space located above a Perfect Electric Conductor (PEC) ground plane and whereε xx ,ε yy andμ zz were the nonzero interacting parameters andε xy =ε yx = 0. Monzon [2] referred to the latter ground plane case as the case where "usual image" theory could be used to find the Green's function of the system. The Green's function for the T M z -PMC case studied herein was derived by introducing and using a novel, linear coordinate transformation, namelyx = (σ P /τ )x + σ Mỹ ,ỹ =ỹ, (Eqs. (6c,d), herein). This transformation, a modification of that used by [2,3], reduced Maxwell's anisotropic equations of the system to a non-homogeneous, Helmholtz wave equation from which the Green's function, G, meeting boundary conditions, could be determined. The coordinate transformation introduced was useful for the present PMC ground plane problem because it left the position of the PMC ground plane and all lines parallel to it, unchanged in position from the original coordinate system, thus facilitating imposition of EM boundary conditions at the PMC ground plane.
40
JaremIn transformed (or primed) coordinates, for the T M z -PMC and T E z -PEC ground plane problems, respectively, the boundary conditions for the Green's functions G T M ≡ E z and G T E ≡ H z were shown to be αor α T E , where α T M and α T E are complex constants (dually related to each other byμ ↔ε), and whereỹ = 0 is the position of the ground plane. An interesting result of the analysis was that the constant α T E (as far as the author knows) coincidently turned out to be the same as the first of two important constants, namely S 1, which were used by Monzon [2, 3] to formulate integral equations (based on Green's second theorem) from which EM scattering from anisotropic objects could be studied.Spatial Fourier transform (k-space) techniques were used to determine the Green's function of the Helmholtz wave equation expressed in transformed coordinates which satisfied the mixed-partial derivative boundary condition of the system. The Green's function G was expressed as a sum of a "free space" Green's function g f (proportional to a Hankel function H (2) 0 and assumed excited by the line source in unbounded space) and a homogeneous Green's function g whose spectral amplitude was chosen such that, when g was added to g f , the sum G = g f + g, satisfied boundary conditions. The kspace, ...